JP2006201145A - Tool for measuring screw hole - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tool for measuring screw hole for easily, accurately and directly measuring the effective depth of a female screw. <P>SOLUTION: The tool for measuring screw hole is provided with a housing, having a cylindrical hole at one end and an occlusion at the other end, a shaft received by the cylindrical hole and fixed to the housing at the occlusion, a sliding cylinder for sliding along a gap between the cylindrical hole and the shaft, a biasing means received by the gap and biasing the sliding cylinder to an opening of the cylindrical hole, a first male screw screwed to the female screw with predetermined dimensions at one end of the shaft, a second male screw screwed to the female screw with the predetermined dimension at the other end of the housing, and a scale mark, provided on an outer circumferential surface of the sliding cylinder and indicating an insertion distance of the sliding cylinder to the gap. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a screw hole measuring tool for testing whether or not a female screw is made with a predetermined size.

  A female screw cannot be screwed into a corresponding male screw unless its inner diameter, valley diameter, valley angle, and pitch are appropriate. It is also important that the depth (effective depth) at which the corresponding male screw can be assembled is also appropriate.

  As a method of testing the effective depth of the female screw, a method of assembling a male screw on the female screw and measuring the insertion length of the male screw is common. In this method, the insertion depth of the male screw is measured by counting the number of rotations of the screw or reading it with a ruler. There is also a method of testing whether a male gage having a predetermined length corresponding to the required effective depth of the female screw is manufactured as a dedicated gauge and can be assembled.

However, the test method for measuring the insertion length of the male screw has disadvantages that the measurement accuracy is insufficient and the operation becomes complicated. On the other hand, in the method of manufacturing the dedicated gauge, the dedicated gauge must be manufactured according to the depth of the female screw to be tested.
Accordingly, the present invention has been made in view of the above problems, and an object thereof is to provide a screw hole measuring tool capable of directly and simply measuring the effective depth of a female screw.

  In order to solve the above problems, the technical means taken in claim 1 of the present invention includes a housing having a cylindrical hole portion at one end and a closed portion at the other end, and the closed portion housed in the cylindrical hole portion. A shaft portion fixed to the housing, a sliding cylinder slidable along a gap formed between the cylindrical hole portion and the shaft portion, and the sliding cylinder housed in the gap Is provided by a biasing means that biases the cylindrical hole in the direction of the opening, and a first male screw portion that can be screwed into a female screw of a predetermined size is provided at the tip of the shaft portion. A scale indicating an insertion distance of the sliding cylinder into the gap is provided on the outer peripheral surface.

Preferably, the scale is provided in at least two places on the outer peripheral surface of the sliding cylinder. Moreover, it is good to provide a groove part in the outer periphery of the front-end | tip part of the said sliding cylinder.
The scale may be provided on the outer peripheral surface on the opening side of the sliding cylinder. A second male screw portion that cannot be screwed into a female screw of a predetermined size may be provided at the other end of the housing.

  According to the present invention, the effective depth of the female screw can be measured directly and simply by reading the scale provided on the outer peripheral surface of the sliding cylinder. Further, since the urging means urges the sliding cylinder toward the opening of the cylindrical hole portion, the urging means can perform smoothly when measuring the effective depths of a plurality of female screws continuously. In addition, since the scale is provided in at least two places on the outer peripheral surface, even if one scale is on the opposite side of the measurer and is not directly visible, the other scale is always visible to the measurer, so the effective depth of the female screw is easy. Can be read.

The best mode for carrying out the present invention will be described below with reference to the drawings.
The housing 1 includes a substantially cylindrical body 2 (cylindrical hole) and a lid 3 (blocking portion) that closes one end of the cylindrical body 2. On the inner periphery of the opening 4 (the side not closed by the lid 3) of the cylindrical body 2, a claw portion 5 is projected.

  A cylindrical shaft 6 is integrally provided on one end side of the lid 3. The shaft portion 6 has a diameter smaller than the inner diameter of the cylindrical body 2, and a street-side male screw portion 7 (first male screw portion) that can be screwed into a female screw of a predetermined size is formed at the tip portion. In addition, a stop-side male screw portion 8 (second male screw portion) that cannot be screwed into a female screw of a predetermined dimension is integrally formed on the other end side of the lid 3.

  In a state where the lid 3 is assembled to the cylindrical body 2, a gap 9 is formed between the inner periphery of the cylindrical body 2 and the shaft portion 6 of the lid 3. A substantially cylindrical sliding cylinder 10 is disposed in the gap 9. One end side of the sliding cylinder 10 protrudes from the opening 4 of the cylindrical body 2 by a predetermined length, and the other end is engaged with the claw portion 5 so that the sliding cylinder 10 is connected to the cylindrical body 2. A convex portion 11 is provided to prevent detachment from the projection. A groove portion 12 is provided on the outer periphery of the distal end portion on the one end side of the sliding cylinder 10. Further, in the present embodiment, the end portion of the street-side male screw portion 7 is configured to protrude a predetermined length (5 mm) from the end portion on the one end side of the sliding cylinder 10.

  On the outer peripheral surface of the sliding cylinder 10, a scale 13 indicating the insertion distance of the sliding cylinder 10 into the gap 9 was provided. In this embodiment, the scale 13 is provided at two locations on the outer peripheral surface opposite to the central axis of the sliding cylinder 10.

  A spring 14 (biasing means) is disposed in the gap 9. The spring 14 is sandwiched between the sliding cylinder 10 and the lid 3 and urges the sliding cylinder 10 in the direction of the opening 4 of the cylinder. Therefore, normally, the sliding cylinder 10 of the screw hole test device is biased by the spring 14, and the convex portion 11 of the sliding cylinder 10 is locked by the claw portion 5 of the cylindrical body 2. It is in the state.

  Further, a through hole 15 is provided through the cylindrical body 2 and the lid body 3 with one end of the lid body 3 inserted into the cylindrical body 2, and a fixing pin 16 (spring The lid 3 is fixed to the cylindrical body 2 by inserting a pin). That is, when the screw hole measuring tool of this embodiment is manufactured, first, the sliding cylinder 10 and the spring 14 are inserted into the cylindrical body 2, and the center of the sliding cylinder 10 and the spring 14 is inserted. The lid 3 is inserted from the shaft portion 6 side so as to pass the shaft. Next, the through holes 15 are aligned, and the fixing pins 16 are inserted into and fixed to the through holes 15.

  Next, the usage form of the screw hole measuring tool of a present Example is demonstrated using FIG. Here, a case where the dimension of the female screw 18 of the object to be measured 17 is measured is considered. Usually, the sliding cylinder 10 of the screw hole test device is biased by the spring 14, and the convex portion 11 of the sliding cylinder 10 is locked by the claw portion 5 of the cylindrical body 2. It is in a state (initial state).

  From this state, the screw hole measuring tool is rotated to screw the street side male screw portion 7 into the female screw 18 by 5 mm. Further, when the street-side male thread portion 7 is screwed, the sliding cylinder 10 is pushed onto the surface of the measurement object 17 and is inserted into the gap 9 of the cylindrical body 2. When the screw hole measuring tool is further rotated to stop the threaded male thread portion 7 from being screwed into the female screw 18, the scale provided on the surface of the sliding cylinder 10 is read and the value is used as the female screw. The effective depth is 18.

  After the measurement, the screw hole measuring tool is rotated in the opposite direction to screwing and removed. At that time, since the sliding cylinder 10 is always urged by the spring 14, the convex portion 11 of the sliding cylinder 10 is automatically locked by the claw portion 5 of the cylindrical body 2. Return to the initial state. When the sliding cylinder 10 is caught inside the cylindrical body 2 and does not return to the initial state, the groove 12 provided on the outer periphery of the distal end of the sliding cylinder 10 may be picked and pulled out. .

  On the other hand, when determining the stop side of the female screw 18, it is confirmed whether the stop-side male screw portion 8 can be screwed into the female screw 18. At that time, if the stop-side male screw portion 8 does not enter the female screw 18, it is determined to be a non-defective product. By doing so, it is possible to accurately measure the effective depth of the female screw and to determine whether it is defective or non-defective.

  Therefore, in this embodiment, the effective depth of the female screw can be measured easily and accurately within a predetermined measurement range indicated on the scale 13. Since the spring 14 urges the sliding cylinder 10 to automatically return to the initial position, it is possible to perform smoothly when measuring the effective depth of a plurality of internal threads continuously. In addition, since the scale 13 is provided at two locations on the outer peripheral surface opposite to the central axis of the sliding cylinder 10, even when one scale is on the opposite side of the measurer, the other scale is visible. Since it is always visible to the measurer, the effective depth of the female screw can be easily read.

  FIG. 4 shows another embodiment. In this example, the scale portion is located deep in the female screw portion on the measured side, and the scale portion is formed on the upper side, that is, on the side opposite to the product to be measured, for convenience when the scale at the tip of the shaft is difficult to read. The screw hole measuring tool 100 measures the effective depth of the female threaded portion 117 of the product A. In this case, since the female threaded portion exists at a considerably deeper position in the product A, the product interferes with the scale on the tip side. To avoid difficult reading. In the figure, reference numeral 108 denotes a stopper, which prevents backlash when the shaft portion 106 rotates and slides, and also has a function of regulating the initial position. Reference numeral 107 denotes a male screw portion, which is screwed with the female screw portion 117 during the measurement of this drawing.

In addition, the thread shape of the said street side male screw part 7 and the said stop side male screw part 8 can be designed in various screw shapes, such as a triangular screw, a square screw, a trapezoid screw, a saw blade screw, a round screw, and a taper screw.

  It is a fragmentary sectional view of the screw hole measuring tool of the present invention.   It is a side view of the screw hole measuring tool of the present invention.   It is a sectional side view which shows the use condition of the screw hole measuring tool of this invention.   It is another Example which shows the use condition of the screw hole measuring tool of this invention.

Explanation of symbols

1 Housing 2 Cylindrical body (cylindrical hole)
3 Lid (blocking part)
4 Opening 6 Shaft 7 Street-side male thread (first male thread)
8 Stop male screw (second male screw)
9 Gap 10 Sliding cylinder 12 Groove portion 13 Scale 14 Spring (Biasing means)

Claims (7)

  A housing having a cylindrical hole portion at one end and a closed portion at the other end; a shaft portion housed in the cylindrical hole portion and fixed to the housing by the closing portion; and the cylindrical hole portion and the shaft portion A sliding cylinder that is slidable along a gap formed therebetween, and a biasing means that is accommodated in the gap and biases the sliding cylinder toward the opening of the cylindrical hole, A first male screw portion that can be screwed into a female screw of a predetermined dimension is provided at the tip of the shaft portion, and a scale indicating the insertion distance of the sliding cylinder into the gap is provided on the outer peripheral surface of the sliding cylinder. A screw hole measuring tool characterized by that.   The screw hole measuring tool according to claim 1, wherein the scale is provided in at least two places on the outer peripheral surface of the sliding cylinder.   The screw hole measuring tool according to claim 1 or 2, wherein the scale is provided on an outer peripheral surface on the opening side of the sliding cylinder.   The screw hole measuring tool according to claim 1, wherein a groove is provided on the outer periphery of the tip of the sliding cylinder.   5. The screw hole measuring tool according to claim 1, wherein a second male screw portion that cannot be screwed into a female screw having a predetermined dimension is provided at the other end of the housing.   A cylindrical housing, a shaft portion that slidably passes through the cylindrical housing, a male screw portion that can be screwed into a female screw to be measured provided on the outer periphery of one end of the shaft portion, and other shaft portions. The male screw part moves relative to the cylindrical housing by rotating the shaft part and is screwed with the female screw part, and the male screw and the female screw are screwed together. The screw hole measuring tool, wherein the distance can be measured by a scale on the other end side of the shaft.   The screw hole measuring tool according to claim 6, wherein a stopper is provided on an outer peripheral portion of the cylindrical housing to restrict relative movement of the shaft portion in the axial direction with respect to the housing.

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